stubs: fully replace qemu-tool.c and qemu-user.c

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/exec.c b/exec.c
index a6923ad..34353f7 100644
--- a/exec.c
+++ b/exec.c
@@ -78,7 +78,7 @@
 /* 0 = Do not count executed instructions.
    1 = Precise instruction counting.
    2 = Adaptive rate instruction counting.  */
-int use_icount = 0;
+int use_icount;
 
 #if !defined(CONFIG_USER_ONLY)